You can take the fan out of Red Sox Nation, but you can’t take Red Sox Nation out of the fan. And that’s the truth.

Former Boston Celtics captain Paul Pierce has been showing his support for the Boston Red Sox throughout their World Series run on social media. From Twitter to Instagram, he has been posting messages and photos in favor of the American League champs.

Pierce celebrated the 2008 NBA Championship with a pregame ceremony at Fenway Park and got to know members of the Red Sox during his 15 seasons in Boston. The Celtics traded Pierce to the Brooklyn Nets in July.

Before the World Series against the St. Louis Cardinals began, Pierce tweeted, “Wanna wish my boi Big Poppi good luck n the World Series bring it home big fella Go Sox”

The following day he showed off his Red Sox apparel on Instagram with plenty of options to choose from for game night.

Prior to Game 4 on Sunday evening, he showed his allegiance in a one-word tweet: “Sooooooxxxxxxx”

On Monday morning, he let his feet do the talking in celebration of the Red Sox series-tying win.

The Red Sox and Cardinals will play Game 5 on Monday night. Pierce may have to catch Game 6 on DVR, though – the Nets open their season that same evening on the road against the Cleveland Cavaliers.